Samuel j



S. J. MILES.

(N0 Model.)

FURNACE.

No. 468,814. Patented Feb; 16, 1892.

UNITED STATES PATENT OFFIC SAMUEL J. MILES, OF CHICAGO, ILLINOIS, ASSIGNOR TO FERDINAND SIEGEL,

OF SAME PLACE.

FURNACE.

SPECIFICATION forming part of Letters Patent No. 468,814, dated February 16, 1892-.

Application filed October 28, 1889.. Serial No. 328,389. (No model.)

To an whom it may concern:

Be it known that I, SAMUEL J. MILEs, residing at Chicago, in the county of Cook and State of Illinois, have invented a new and usefullmprovement in Furnaces, of which the following is a specification.

My invention relates to furnaces, and par ticularly such as are adapted to be used for the purpose of burning slack and the like, and has for its object to provide. convenient means for this purpose.

My invention is illustrated in the accompanying drawings, wherein- Figure 1 is a cross-section of the fire-box, showingmy appliances in position. Fig. 2 is a transverse section of the same view, parts in section and parts broken away. Fig. 3 is a view of the air-pipes. Fig. 4 is a cross-sect1on of one of the gratebars; Fig. 5, a crosssection of grate-bar cover; Fig. 6, a plan view of the same.

Like parts are indicated by the same letters in all the figures.

A is the boiler, suit-ably supported 5 B, the fire-box; G, the ash-pit, and D D the surrounding walls.

E is a fan, from which leads the pipe E, having the branches E E, which terminate, respectively, in the distributing-tubes E E from each end of each of which rises a pipe E These pipes are connected above by the cross-pipes E F F are perforated pipes passing longitudinally through the V-shaped grate-bars G and resting on the cross-bridges H H in the same. Each pipe F F opens at its extremities into the pipes E E, as indicated in Fig. 1. The cross-bridges H H divide the grate-bars G into compartments, as indicated, and from each of these compartments opens downwardlya perforated nipple J. Each of these nipples has a transverse slot, through which reciprocates the slide K. This slide is provided with a series of apertures L L, which .can be made to register with or intercept the apertures inthe nipples J J. Each grate-bar G is provided with a cover M, and this cover is provided with a number of longitudinal slots N N and a series of cross-grooves O. The grate-bars G terminate at the extremities in the curved portions P P, adapted to receive the transverse pipes E and perforated to permit the passage of the pipe F therethrough.

R is the passage-way leading to the ash-pit, and S the passage-way leading to the fire-box. These parts might be greatly changed without departing from the spirit of my invention.

The use and operation of my invention are as follows: A quantity of coal-slack, preferably hard-coal slack, being placed upon the gratebars G or in the fire-box B and the passages at the apertures R and S being preferably closed, a suitable blast of air is driven by the fan E through the pipe E and pipes E into pipes E E gwhence it passes through the upwardly-turned pipes E E into the transverse pipes E From these latter it passes in both directions into the pipes F F in the grate-bars G, whence it is expelled through the apertures in such pipe and through the slots N N in the covers M of the grate-bars. This secures the even and'regular distribution of the air. The arrangement of the parts is also such that the ash-pit is always clear, thus permitting free access to the working parts of the furnace. 'When the grate-bars G become clogged, they can be cleaned by moving the slide K until its apertures L register with the apertures of the nipples J, whereupon the blast of air will discharge the contents of each section or compartment of the grate-bar through its nipple J into the ash-pit. The various pipe connections can be made in any desired and convenient manner and by any suitable couplings, nipples, and connections such as are commonly used for similar purposes. The grate-bar lids M are made so as to fit between the sides of the bars, so that the grate presents a practically uniform surface with occasional slots. These slots are greatly enlarged for the purposes of with apertures therein, supply-pipes connected therewith and leading thereto through the corners of the ash-pit, and a fan which forces air into such supply-pipes.

2. In a furnace, the combination of a series of V-shaped grate-bars with perforated supply-pipes passing therethrough and perforated lids thereon.

3. In a furnace, the combination of a series of grate-bars with supply-pipes passing therethrough and cross-bridges therein on which such pipes rest.

4A In a furnace, the combination of an open spaced fire-box, an ash-pit with hollow gratebars, an underground supply system of pipes and connections between such system, and

grate-bars passing through the corners of the ash-pit, so as not to obstruct the same.

5. In a furnace, the combination of a series of grate-bars, each having a series of downwardly-depending perforated slotted nipples, and a series of perforated slides adapted to reciprocate through the slots in the nipples of each grate-bar.

6. In a furnace, upwardly-open grate-bars provided with a perforated lid therefor, the same transversely slotted to permit of an easy breaking into sections.

SAMUEL J. MILES. l/Vitnessesz FRANCIS W. PARKER, CELESTE P. CHAPMAN. 

